214
R. Barrett and P. P. Delsanto
3. Einstein to Lemaitre, 26 September 1947, Einstein Archives Doc. 15 085. Kragh,
Helge, Cosmology and Controversy: The Historical Development of Two Theories
of the Universe, Princeton: Princeton University Press, 1996, p 54
4. Weinberg S (1972) Gravitation and cosmology. Whitney